The basic principle underlying the organization of any library is to describe the documents it contains so that they may be located. All libraries create sets of records which describe the documents in their collections. Catalogs are sets of records to documents that share a location. Indexes are sets of records to documents that share some other attribute (generally subject matter). In some disciplines, such as business and market research, the research process is one of gathering intelligence rather than reviewing the scholarly literature. It is best to familiarize yourself with as wide a range of licensed databases as possible whenever conducting business or marketing research.